Remaneicaris paratridactyla, Corgosinho, Paulo Henrique C. & Arbizu, Pedro Martínez, 2007

Corgosinho, Paulo Henrique C. & Arbizu, Pedro Martínez, 2007, Three new species of Remaneicaris Jakobi, 1972 (Copepoda, Harpacticoida, Parastenocarididae) from the Ribeirão do Ouro River, Minas Gerais, Brazil, with some remarks on the groundpattern of the Parastenocarididae, Zootaxa 1437, pp. 1-28 : 11

publication ID	https://doi.org/ 10.5281/zenodo.175898
DOI	https://doi.org/10.5281/zenodo.6237265
persistent identifier	https://treatment.plazi.org/id/03FE4078-476F-2417-FF6A-B084FB78449E
treatment provided by	Plazi
scientific name	Remaneicaris paratridactyla
status	sp. nov.

Treatment

Remaneicaris paratridactyla n. sp.

Type material. Holotype, 1 male, dissected and mounted on 7 slides ( INPA 1391a–g).

Paratypes: 1 dissected female mounted on 7 slides ( INPA 1392a–g), 1 male mounted on 9 slides ( INPA 1393a–i), 1 undissected male ( INPA 1394a) and 1 female ( INPA 1394b) mounted on one slide each other.

Etymology: The species name refers to the complex structure of the modified thumb of leg 3, somewhat similar to the homologous structure found in R. tridactyla n. sp.

Locus typicus: Ribeirão do Ouro river, Sítio do Corgosinho; Florestal, state of Minas Gerais, Brazil. Coordinates: 19°48’19”S, 44°27’45”W.

Male ( Fig 8 View FIGURE 8 A–B). Length 413 µm (measured from the tip of rostrum to the posterior rim of anal operculum). Rostrum with wide base and 2 sensilla on tip. Cephalothorax and second urosomite each with 1 dorsal integumental window. Urosomite 5 with lateral integumental window. Dorsal pores on cephalothorax, thoracic somites 1 and 3 and second urosomite. One pair of lateral pores on telson. Arrangement of sensilla on tergites illustrated in Figs. 8 View FIGURE 8 (A–B). Telson ( Fig. 9 View FIGURE 9 A–B) with a dorsal row of 8 spinules on the anterior half (ARS) and 2 rows of 3 spinules on the posterior half (PRS), near the operculum; ventrally, with a row of 4 spinules near the insertion of the furca. Anal operculum quadrate, without spinules. Furca 3.5 times longer than wide, with 7 setae, all located on distal third. A1 ( Figs. 10 View FIGURE 10 A) 9-segmented and prehensile; armature beginning with proximal segment: 0/5/4/2/5+Ae/1/4/2/9+Ae, last segment with 1 modified seta as in R. tridactyla n. sp. A2 ( Fig. 10 View FIGURE 10 B) with allobasis; 1-segmented exp with 1 seta, and 1-segmented enp with 7 setae. Mouthparts armature as R. tridactyla n. sp.; leg 1, leg 2 and leg 4 ( Fig. 11 View FIGURE 11 A, B and E) similar to the respective appendices of R. tridactyla n. sp. male. Leg 3 ( Fig. 11 View FIGURE 11 C and D) coxa without setae or spines, with 2 rows of spinules on the posterior side; basis with outer seta; enp 1-segmented with 1 terminal seta; exp 1-segmented, elongate, bearing 2 rows of spinules along outer margin; subdistally, with 1 very modified seta (thumb). Leg 5 ( Fig. 10 View FIGURE 10 C) triangular, ending in a spinulous process and with all setae located on the outer margin.

Female: Sexually dimorphic in number of body segments, A1, leg 3, leg 4 and genital field.

Habitus ( Fig. 12 View FIGURE 12 A–B). Length 456 µm (measured from the tip of rostrum to the posterior rim of anal operculum). For pores and sensilla see Fig. 12 View FIGURE 12 A and B. Telson ( Fig. 12 View FIGURE 12 A–B) with a dorsal row of 9 spinules on the anterior half (ARS) and 2 rows of 3–4 spinules on the posterior half (PRS) near the operculum; ventrally, with a row of 4 spinules near the insertion of the furca. Operculum quadrate, without spinules. Furca 4 times longer than wide, with 7 setae, all located on distal third. A1 and A2 ( Fig. 13 View FIGURE 13 A–B), mouthparts, leg 1, leg 2, leg 3, leg 4 and genital field ( Fig. 14 View FIGURE 14 A–E) are similar to the respective structures of females of R. tridactyla n. sp., but with some differences in the ornamentation of the basis of legs 1 to leg 4.